Definitions

1. noun

A unit of measurement for the amount of light emitted or received by a source, equal to the light intensity produced by one candle.

“The new light bulb emits 800 lumens, making it brighter than the previous one.”

2. noun

The quality of giving off light, or the state of being lighted.

“The city’s lumen is low at night, making it difficult to navigate without a flashlight.”

3. noun

A unit of measurement for the luminous flux in the SI system.

“The lumen of a car’s headlights is an essential factor in driving safety.”